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Tutorial 5:
Multiple Linear Regression 2

Last updated:
07 Apr 2005

Assumed knowledge

  • Multiple Regression 1 (tutorial)

  • Francis Section 5.1 "Multiple Regression"

Data files

Design your Own MLR & Dummy Coding

  1. Conduct a meaningful MLR analysis (of your own design) and be able to interpret the analysis - explain it to someone next to you or your tutor.
  2. For the above analysis, obtain and interpret an analysis of multivariate outliers (use Mahalanobois and Cook's Distance - see notes in previous tutorial)
  3. Conduct a meaningful MLR analysis which requires you to recode one or more of the variables as dummy variables.
  4. For either of the above analyses, conduct the analysis using each of Direct, Forward, Backward, Stepwise, and Hierarchical methods.  Be able to interpret and analyse why or why there aren't differences between the output for each method.

Partial Correlations

  1. Work out how to produce stand-alone partial correlation tables in SPSS.
  2. Produce stand-alone correlations and partial correlations from any dataset and be able to depict this data in a Venn Diagram.

Critical Reading of MLR in Articles

  1. Find a published research article which has used Multiple Linear Regression.
  2. Briefly summarise, explain and critique the articles' use of Multiple Linear Regression.  You should include and interpret the articles' APA reference details, describe variables, summarise the research question/hypothesis, relevant statistics and relations amongst the variables.  Also emphasize what the results mean.  You are also encouraged to make critical comment, e.g., Is this use of regression appropriate?  Could/should the analysis have been conducted differently? (these questions are only suggestions)
  3. IMPORTANT: You will be asked this question in the MLR2 quiz - it will be worth 1.5 marks.  You may pre-prepare your answer and then cut and paste from an electronic attachment during the exam (e.g., beforehand email it to yourself, bring on a floppy disk or data key).  Alternatively you could print it out and then retype in during the exam.
  4. Word limit: 250 words - longer answers will have a penalty applied.